（）都是矿井通风的安全管理制度之一。A、瓦斯检查制度 B、瓦斯_爱下问搜题

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问题多项选择题

（）都是矿井通风的安全管理制度之一。

A、瓦斯检查制度

B、瓦斯排放管理制度

C、瓦斯抽放管理制度

D、入井检身制度

答案

参考答案：A, B, C

问答题

市售尿素中，主要成分甲酰胺[化学式为：CO（NH₂）₂]含量在96%以上为达标一级产品．请回答：

（1）甲酰胺中氢和氧元素质量比为______，碳元素的质量分数为______．

（2）一袋包装为50Kg的尿素中，若按一级产品出售，含甲酰胺的质量不少于______Kg．

完形填空

It was my first year teaching in a special needs class, and I wasn’t sure what to expect at our yearly Special Olympics sports meeting. My   36  had some challenges, from learning disabilities to cerebral palsy（大脑性麻痹）.
Mark was one with the latter. Restricted to a   37 , he had to fight his spasms （抽筋） just to control his movements.   38 , he always had a positive attitude and greeted everyone with a huge smile.
His classmates   39  him and always took the time to make sure he was included in group activities, especially Mike, Andy and Lucas, three boys who were good at   40 . Obviously, Mark wanted to be like them, unrestricted by the limitation of his   41  and watching them moving on the playing field seemed to fill him with   42 .
When the day came, Mike, Andy and Lucas   43  well in their sports events, and gave the normally calm audience something to cheer about. Mark sat in his wheelchair on the sidelines,    44  them on.
The final event of the day was the 400 meter race.   45  was invited to either walk or run, according to their ability, around the   46  length of the track.
When Mike, Andy and Lucas reached the finish line, they   47  and turned to look behind them. At the   48  of the crowd, determined not to be left behind, was Mark. All his classmates had   49  him. He was alone on the track with over half the distance left to   50 .
Mike, Andy and Lucas looked at each other, and a silent   51  passed between them. Slowly, they jogged   52  towards their friend, cheering him on   53  he had done for them moments before.
The progress was   54 , but in the end the three star runners and Mark crossed the finish line together to the enthusiastic cries of their teachers and classmates. Seeing the look on Mark’s face as he crossed the finish line, hands upraised and laughing, I came to understand what   55  the Special Olympics, and the determined athletes who compete, so extraordinary.
Years later, I’m still cheering them on.